1. Mint Mark: 1928 silver dollars were minted in three different locations: Philadelphia (no mint mark), Denver (D mint mark), and San Francisco (S mint mark). The mint mark can affect the value of the coin.
2. Condition: The overall condition of the coin is important in determining its value. Factors such as scratches, wear, luster, and any other signs of damage can impact the coin's grade and value.
3. Error or Misspelling: The specific error or misspelling of the word "In God We Trust" can also influence the value of the coin. Some errors are more rare and sought after than others. Collectors often refer to errors by their catalog numbers in specialized numismatic references.
In general, misspellings or errors on coins can increase their value among collectors who specialize in error coins. However, it's essential to have the coin authenticated and graded by a reputable numismatic organization to determine its exact value. A professional appraisal can provide you with an accurate estimate based on the specific characteristics of your 1928 silver dollar with the misspelling.